Measured-service telephone system.



R. C. GIFFORD.

MEASURED SERVICE TELEPHONE SYSTEM.

APPLICATION mm NOV. 14, I906. RENEWED MAR. 1. 191a.

Patented Oct. 8,1918. 2 SHEETS-SHEET I JZZ 72.??55

R. C. GIFFORD.

MEASURED SERVICE TELEPHONE SYSTEM.

APPLICATION FILED nov. 14. I906. RENEWED MAR. 1. 19m.

1,281,251 Patented Oct. 8, 1918.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

BOY C. GIFFOBD, 0F CHIOAQO, ILLINOIS, ABSIGNOE, BY MESNE A$SIGHHENT8, TO AUTOMATIC ELECTRIC COMPANY, A CORPORATION OF ILLINOIS.

MEASURED-SERVICE TELEPHONE BYBTEH.

Application flied November 14, 1906, Burial No. 843,397.

To all whom it may concern.

Be it known that I, Roy 0. Grrrono, a citizen of the United States of America, and resident of Chicago, Cook county, Illinois, have invented a certain new and useful Imrovement in Measured-Service Telephone Systems, of which the following is a specification.

My invention contemplates improvements on automatic telephone exchange systems of the general character disclosed in application No. 343,042, filed Novl'12, 1906, by J. Erickson; and in some respects my present invention is an improvement on the system disclosed in my prior application No. 343,396, filed Nov. 14, 1906.

Objects of my invention are to provide a highly efficient automatic common battery pay-station telephone exchange system; to provide means by which the pay-station of any callin subscriber is under the control of the ca led substation, so that toll is collected or assessed b the answering subscriber; and to provi e certain novel features and details of construction and combinations tending to increase the general elliciency of a system of this particular character.

To the foregoing and other useful ends, my invention consists in matters herein disclosed and claimed; and b the term paystation I mean one at which the telephone cannot be used without depositing a coin or paying toll in some other known or suitable Iii the accompanyinp drawin Figure 1 shows dia rammatical y a calle substation and a cal ing substation, of my improved type, connected through the medium of switches at a central oflice. In the said oilice the calling substation #500 has allotted to it the first-selector A of the general tpe disclosed in United States Patent 0. 815,321, granted March 13, 1906 to Keith, Erickson and Erickson. It will be noted that the central battery B preferably has its positive terminal grounded. The operatin relays of the central switches are norma y connected to the nonu-nded terminal of said battery,-sc that t e subscriber, bye grounding his line conductors, may opera the said switches as is usually the custom in systems of the class in connection with which'I have" elected to illustrate my inven- Speolflcatlon ot'Lettera Patent.

Patented Oct. 8, 1918.

Renewed larch l, 1918. Serial No. 219,867.

tlon. In addition to the said first-selector there 15 shown at the central ofiice any suitable connector C, for example of the neral type descrlbed in United States Patent No. 810,176, granted March 13, 1906, to Keith, Erlckson & Erickson, and of the common battery t lpe described in application No. 294,603, ed January 4, 1906, by T. G. Martin. The first-selector D, similar to the selector A, is allotted to the called line. Substation #500 is shown temporarily connected with the substation #220, which latter is shown in normal condition. When the subscriber at substation #220 removes the receiver to answer, both the calling and called substations are then provided with battery current for talking purposes.

The coin-collecting device comprised in my invention may be considered as an attachment with suitable'terminals which may be electrically connected with the circuits of the telephone proper, as diagrammatically shown at E. At the substation #500 the ground-controlling springs 2 and 3 are shown pressed into engagement by the arm 4. This operation takes place when the coin 5 comes into contact with the arm 6. The

normal position of the said springs is shown at substation #220. A .circuit-controllin relay 7 is'shown at substation #500 with its armature 8 in normal position, said relay becoming energized when the called subscriber removes his receiver from the switchhook. The latter thus closes a circuit at his telephone which supplies the called substation with talking batterv current, and as a subsequent result the calling line is also supplied with talking battery current. The re ay 7 upon energization attracts its arma-' ture 8, which closes in contact with springs 9 and 10, thereby completing the talking circuit at the substation #500.

Fig. 2 is a side view of the coin-collecting device, showing the coin-trough and the ground sprin 2 and 3.

Fig. 3 18 a ront view of the same, showing thecircuit-controlling relay 7 and the t-i of its armature 8 obstructing the coin-tron or chute. The coin-collecting device is suitably secured to the telephone box by the bolts. 11. I

The pay-station attachment, as shown in the draw ngs, may be used in connection with a substation of any suitable or approved .the cam arm'2 descends the three release sprlngs are and condenser 19. In addition to the abovementioned parts there is rovided an imulse wheel 20 which has t e usual vertical impulse teeth 21 that are adapted to operate the vertical impulse spring v22. The lmpulse wheel also carries the rotary impulse tooth 23 which operates the rotary impulse spring 24. The said impulse wheel is, of course, rigidly secured to the dial shaft. The switch-hook has radiating from its bod a number of cam arms 25, 26 and 27 an is ivotally secured to the keyboard,not shown. he cam arm controls the so-called locking cam 28. When the co'ciperatin ground springs 29 and 30 engage, the groun post 31 is then connected to the substation ground G, providing the ground-controlling sprin s 2 and 3 are in contact. When the swito hook is down the cam arm 26 maintains the springs 21 and 23' in contact, thereby bridging the ringer 18 in series with the condenser 19 across the line. The springs 31 and 32 are then disengaged, and the primary circuit including the primary winding 15 and transmitter 17 is interrupted. The signaling device whereby a subscriber may signa another after connection has been established comprises a push-button 33 and a spring 34 which normally engages the contact omt 35; but when the button 33 is presse the spring 34 leaves the contact o1nt 35 and engages the contact point 36 w ich is connected with the substation ground G. Means whereby the subscriber may release the central station apparatus brought into service com rises three springs 37 38 and 39, known as t e release s rings, and so controlled b that'when the switch-boo brought into contact} thereby grounding both of the subscribers line conductors simultaneousl Furthermore, the substation is provi ed with the condenser 40 so connected that the primary circuit is completed through the said condenser when the springs 9 and 10 are not in en agenient. This 1s provided in order that t e calling subscriber may 'hear the busy signal, even throu h the relay 7 has not 0 erated and close the primary circuit t rough the sprin 9 and 10. a l

If t e subscriber at substation #500, for

example, wishes to call the subscriber at sub- 2 station #220, he first removes the receiver 12 05 to rest upon the tip 19' of the armature 8.

from the switch-hook 13 and then deposits a suitable coin in the slot, which coin comes When in this position said coin bears against the arm 6, which in turn imparts an upward motion to the arm 4, thereby closing in contact the springs 2 and 3, and thus placin r the substation ground G in connection witi the ground spring 30 through the ground post 31. The calling subscriber suitably operates the dial for the first di it 2. On the return motion of the dial tic vertical impulse spring 22 and therotary impulse spring 24 come into contact with the round post 31, in the order named, grounding the vertical and rotary line conductors 41 and 42, respectively, the former'twice and the latter once. Likewise, when the second digit 2 and the last digit 0 are called,the line conductors are grounded correspondingly a proper number of times. digit is called the first-selector shaft wipers 43, 44 and 45 are raised to the second level of the line and private banks, as follows: When the spring 22 engages the ground post 31 an energizing circuit is established through the vertical relay 46 of the first-selector A. The current in this circuit flows from ground G through the springs 3 and 2, springs 30 and 29 to the ground post 31, thence to the vertical impulse spring 22, vertical line conductor 41, side switch wiper 47, contact point 48, vertical line relay 46, through the bridge-cutofl' springs 49 and 50 to the battery lead 51, thence through battery B and to ground G. Each time the-vertical line relay 46 is energized the springs 52 and 53 are pressed into engagement and an energizing circuit is established each time through the vertical magnet 54. The circuit through the said magnet extends from ground Gr to the springs 52 and 53, private magnet springs 55 and 56, vertical magnet 54 to the battery lead 51, thence through battery B and to ground G. The vertical magnet being operated twice the first-selector switch-shaft wipers 43, 44 and 45 are carried opposite the first contact of the second bank level that comprises the contact points which constitute the terminals of the trunk lines leading to the connector C. Following the vertical impulses the rotary impulse spring 24 comes into contact with the ground post 31, thereby grounding the rotary line conductor 42 once and ener 'zing the rotary line relay 57 of the first-se ector once. The path of the energizing circuit may be traced as follows: From the substation ground G through the springs 3 and 2 to the springs 30 and 29, to t e ground post 31, rotary impulse sprin 24, rotary line conductor 42, side switcii wiper 58, contact point 59, rotary line relay 57, bridge-cutoff springs 60, 49 and 50 to the battery lead 51., thence through battery B and to grOun d G. The rotary line relay 57 upon one zmg closes in contact the springs 61 an 52, thereby closing an enero l o I gizmg clrcuit through the private magnet After the first 62 which extends from ground G through the springs 52 and 61, private magnet 62 to the battery lead 51, thence through battery B and to ground G. The private mag- 6 net 62 being energized for a,moment, t e side switch of 'the first-selector A passes from first to second position, thereby permitting the side switch .wiper 63 to engage the contact point 64, thus closing a c1rcu1t 10 thro h the rotary magnet 65. The currentow is from ground G to the contact point 64, side switch wiper 63, through the first coil of the rotary magnet to the interrupter sprin 66, thence through the second coil of t e rotary magnet to the battery lead 51, and through battery B to ground G. The rotary magnet is energized one step and the shaft wipers 43, 44 and 45 are carried into enga ement with the bank contacts that constitute the terminals leadlng to the connector switch C, assuming that the trunk leading to the said connector leads ofl to the first set of contacts of the second level. But if the first trunk line is busy the first private bank contact is grounded in the well known maner, and an energizing circuit is established through the private magnet 62 when the private wiper 45 strikes the rounded private bank contact, thereby retaining the side switch in second position and thus maintaining the energizing circuit through the rotary magnet 65. The rotary magnet, by continuing to rotate the wipers, breaks the energizing circuit of the private. magnet as 36 soon'asan idle line is found, and as soon as the private magnet is deenergized the side switch is tripped into third position; but if there are nobusy contacts to be passed over, as assumed in the first instance, the rotary magnet 65 as is well known, trips the side switch to third position, with the result that the side switch wipers 47, 58, 63 and 67 engage the respective contact points 68, 69, 70 and 71, thus extending the subscribers line conductors 41 and 42 to the connector 0. Also, since the side switch wiper 67 engages thegrounded contact point 71, a guarding potential is established at the prlvate wiper 45 for protecting the seized trunk line from being molested by any other switch. The second digit is called after the subscriber has established connection with the connector C by way of the trunk conductors 72 and 73. The subscriber also rotates the dial for the second digit 2, thereby grounding the vertical and rotary line conductors 41 and 42, which causes the energization of the connector vertical and rotary line relays 7 4 and 75. The current for energizing the vertical relay 74 flows overthe following path: 'Fromground G through the springs 3 and 2 to the vertical impulse spri 22, vertical line conductor 41, side switc wiper 47, first-selector shaft wiper 43, conductor 72 66 to thevertical line relay 74, through the winding 76 of the difierential relay 77 to the battery lead 51, and through battery B to ground G. Of course, the relay 77 becomes energized, since the winding 76 is in series with the winding 74; but the energizetion of the said differential relay at this time is without effect. Each time the vertical relay 74 is energized the line relay springs 8 and 79 are pressed into contact, thereby closing an energizing circuit through the vertical magnet over the followin ath: From ground G to the springs 79 an 8, private magnet springs 71 and 80, side switch wiper 81, contact point 82, vertical magnet 70' to the battery lead 51, thence through battery B and to ground G. The vertical magnet, thus energized, operates to raise the shaft and shaft wipers one step at a time until the said wipers are carried two steps to the bank level in which are located 85 the terminals of the line #220. When the rotary line conductor 42 is grounded the retary line relay becomes energized through the following path: From ground G to the springs 3 and 2, ground post 31, rotary im- 00 pulse spring 24, rotarv line conductor 42, side switch wiper 58, shaft wiper 44, trunk conductor 73, rotary line relay 75, winding 84 of the difierential relay 77, springs 85 and 86 to the battery lead 51, thence through battery B and to ground G. Since the winding 84 of the differential rela'y 77 is in series with the rotary line relay 75, the differential relay 77 becomes operative, but at this stage it is without effect. The energization of the rotary line relay 75 causes the energization of the private ma et 83 over a circuit extending from groun G through the springs 79 and 87 to the private magnet 83, springs 85 and 86 to the battery lead 51, 1 thence through battery B to ground G; and the release of the side switch from first to second position, thus placing the wi ers 88, 89,- 90 and 91 in connection with t eir respective contact points in second position. 11 The last digit being naught the subscriber operates the dial, as previous] described, grounding the vertical line con uctor 41 ten times and the rotary line conductor 42 once. The vertical and rotary line relays 74 and 75 are operated over previously traced circuits. However, when the line relay springs 78 and 79 engage, a circuit is closed through the rotary magnet 92 instead of through the vertical magnet 70. The energizing circuit ex- 12 tends from ground G through the springs 79 and 78, private magnet springs 71' and 80, side switch .wiper 81, contact point 69', rotary magnet 92 to the battery lead 51, thence through battery B and to ground G. Each time that the rotary magnet is energized it operates to rotate the shaft and shaft wipers 93, 94 and 95 one stepat a time until the said wipers are carried into enga ement with the normal conductors 96, 9 and energizing circuit through the private magnet 83, which now operates with one of two result-Hither the release of the side switch from second to third osition, or the socalled busy release of tlB connector, wh1ch is brought about in the well-known manner. Suppose the former result to occur and the side switch to pass to third pos tion, thus placing the side switch wipers 88, 89, 90

and 81 in contact with their respective contact points in third position. Furthermore, when the .side switch passes to third position a guarding potential is established or protecting the called line. This potentlal extends from ground G, contact point 99 to the side switch wiper 90,'switch shaft wiper 95, which engages the rivate contact of the called line. The sai guarding potential also closes an energizing circuit throu h the brid e-cut-ofl relay 100 of the first-so ector D, t ereby removing the bridge formed by the vertical and rotary line relays of the said selector D. To si al the called subscriber the calling subscri er presses the signaling button 33, placing the spring 34 in contact with the substatlon ground, thereby energizing the vertical line relay 74. The path of the energizing circuit extends rom ground G through the springs 3 and 2, springs 30 and 29, contactpoint 36, s ring 34, springs 31' and 32 to the vertica line conductor 41, through the relay 74, winding 76 of the difl'erential relay 77 to the battery lead 51, thence through battery B and to ground G. It will be remembered that the connector side switch has passed from sec 0nd to third position, and that the side switch wiper 81 is in engagement with the contact point 101 thereby placing the vertical line role 74 in control of the ringer relay 102 in t e same manner in which the rotary magnet 92 came under the control of the vertical line relay when the side switch assed from first to second position. Thereore, when the vertical line relay 74 presses the springs 78 and 79' into contact the ringer relay 102 is energized by a flow of current from ground G through the s rings 79 and 78, private magnet springs 71 and 80, side switch wiper 81, contact (point 101, ringer relay 102, springs 101' an 129 (bearing in mind that the differential relay 77 is ener gized) to the battery lead 51, thence through battery B and to ground G. The ringer relay upon energizing shifts-the spring 103 from the sprin the sprin 106 is shifted to engage with the ring 10 This results in bridging across t e called subscribers line the termmals of the ringer generator F.' A signaling current is, therefore, sent from the generator F 104 to the spring 105, and

to the ringer relay springs 107 and 106, side switch wiper 88, contact point 108, shaft wiper 93, normal conductor 96, vertical line conductor 109, condenser 110, ri er 111, springs 112 and 113 to the rotary line conductor 114, rotary normal conductor 97, shaft wiper 94, contact point 115, side switch wiper 89, ringer relay springs 103 and 105 back to the generator F. As soon as the callin subscriber ceases" topress the signaling utton 33 the ringer relay 102 becomes deenergized and the springs 103 and 106 resume their normal position. The subscriber at substation #220, in response to the signal, removes the receiver 116 from the switch-hook 117, which allows the springs 118 and 119 to engage and the springs 112 and 113 to disengage, thereby removing the ringer 111 from across his line. The engagement of the springs 119 and 118 closes a series energizing circuit through both windings of the relay 122 at the connector C and the relay 123 at substation #220, extending from ground G to the contact point 99, side switch wipler 90, winding 124 of the relay 122, throug the ringer springs 104 and'103, side switch wiper 89 contact point 115, shaft wiper 94, rotary line conductor 114, conductor 125, through the relay 123, conductor 126 through the signaling device of the called substation, through the springs 119 and 118, vertical line conductor 109, shaft wi er 93, contact point 108, through the win ing 127 of the relay 122, springs 128 and 129 to the battery lead 51, thence through batter B and to ground G. The energizing of t e relay 123 causes its armature to close in contact the s rings 130 and 131, whereb the rimary ta king circuit is completed rom t e rotary line conductor 114, through the primary winding 132 of, the induction-coil 121, transmitter 133, springs 131 and 130,'con'ductor 126, through t e signal device and springs 119 and 118 to the vertical line conductor 109. The relay 122 upon energization operates to shift the spring 85 from the spring 86, which latter is connected to the battery lead 51, to the spring 134, which is in turn connected with ground. This reversal of the polarity of the s ring, 85 sets up an ener zin circuit whic supplies the callin suEscri er with talking battery current anfi operates the relay 7 at substation #500. This circuit may be traced from ound G to the contact point 99, side switch wiper 90, through the springs 134 and 85, winding 84 of the differential relay77, rotary line relay 75, shaft wiper 44, side switch wiper 58, rotary line conductor 42, conductor 135, relay 7, conductor 136, I contact point 35, spring 34,

"s rings 31' and 32 to the vertical line conuctor 41, side switch wi er 47, vertical line relay 74, winding 7 6 of th s difierentialrelay 77 to battery lea 51, thence through battery closes t 13 and to ground G. The relay 7 upon energization attracts its armature 8, whereby the springs 9 and 10 engage, and the supporting tip 19 is drawn from beneath the coin 5, thus permitting the latter to pass from engagement with the cam 6 and the springs2 an 3 to again resume their normal position. The engagement of the springs 9 and 10 e primary circuit extending from the rotary line conductor 42 through the winding 15 of the induction-coil 14, transmitter 17 to the springs 9 and 10, conductor 136, through the si al device to the s rings 31 and 32 and to t e vertical line con uctor 41. The two substations are now connected and communication may be carried on over the circuit shown by the heavy lines in The release of the 'switchingapparatus is brought about when the calling subscriber restores the receiver 12 to the switch-hook 13, thereb pressing into engagement for a moment the release sprin s 37, '38 and. 39. The contact of the sai release springs rounds the vertical and rotary line conuctors 41 and 42 simultaneously from ground G to the release s ring 39, thence through the springs 38 an 37 to the vertical and rotary line conductors. The grounding ofthe rotary line conductor 42 roduces a short-circuit of the rotary rela 5 in series with the winding 84 of the di ferential relay 77 extending rom ground G to the contact point 99, side switch wiper 90,

springs 134 and 85, winding 84 of the differential relay 77, rotary line relay 75 to the rotary line conductor 42, to the release springs 38 and 39 and to, ground G. Therefore, since the winding 76 of the diflerential relay 77 alone carries current, the said relay thereby becomes energized and attracts its armature which shifts the spring 1291mm contact with the spring 128 to contact with the spring 101'. he disenga ement of the springs 129 and 128 destroys t e energizing clrcuit through the relay 122, and the spring 85 passes from engagement with the sprin 134 into contact with the sprin 86, whic removes the said short-circuit o the rotary relay 75 and winding 84 and instead establishes an energizing circuit extending from the substation ground G, through the release springs 39 and 38 to the rotafirfiy line conductor 42, side switch wiper 58, aft wiper 44,

relay 75, winding 84 of the diiferential relay The said im ulse energizes the rota as a resu t the switch shaft and side switch are restored to normal position, thus break- 1 the connection between the connector switch-shaft wipers 93, 94. and 95 and the normal conductors 96, 97 and 98. The backrelease relay 139 being in the same circuit with the release magnet energizes simultaneously with the latter and operates to close a circuit through the selector release ma et 140' by pressing the back-release springs 137 and 138' together. The circuit through the said release magnet 140 extends from ground through the springs 137 and 138 to the release ma et 140, thence to the battery lead 51, and through battery B to ground G.- When the ground to the line conductors 41 and 42 is interrupted all the magnets involved in the release are deenergized and all the switches are fully reof course, denergized and the armature 8 is restored to normal position by the tension of thespring 10. If the called line #220 is busy at the time that the calling subscriber #500 attempts to establish connection, the

.connector C is released by the last im ulse to the rotary line conductor42, as fol ows: line relay 75 of t} e connector 0, which re ay in turn energizes the rivate, ma et 83, pressing the private spr ngs 55' an 56 into contact after theprivate wiper 95 has been carried onto'j th ounded rivate bank contact. It, rstood, 0 course, that whenever alin heconnector private bank contacts v, the private at he, selector D, are all connected to 'gro Therefore, smce the connector side switche in second position, when the rivate .55. and 56' are brought into-contact lan -genergizing circuit is established throng the ease magnet 140 from the-said "grounded rivate bank contact to the tewiper 5, thence to the side switcher-9(l n h'ich is in second position, pr ratemagnet springs 55 and 56 to the re ease. magnet 140, thence to battery B and to ground G. The connector switch-shaft and side switch are thus released in the well-known manner, and connection is not established with the called line; and there is no liability of the backbridge relay 122 energizing, thus making it impossible for the calling line to receive talking battery current, or for the substation relay 7 to energize. As a result the coin 5 is retained within the channel, as shown in Fi 2, and when the subscriber receives the fiusy signal, and subsuently hangs up his receiver, the shutter is removed from in front of the coin 5 which latter then rolls out into the on 147. The busy signal is, of course, estab ished when the subscriber presses his signaling button 33 after he has completed the calling operations, and, ofcourse, after the connector is released, as described, in which case the connector side switch is in first position, as explained. As a result the vertical line conductor 41 is grounded when the signalin button spring 34 is carried onto the groun contact 36, whereb the vertical line relay 74 is energized. herefore, the line relay springs 78 and 79 are brought into contact, and the vertical ma et is o erated to raise the switch-sha t, whereby t e oil-normal springs 103 and 104 are brought into contact and a busy signaling current sent to the calling substation from the busy coil H through the springs 104 and 103'to the side switch wiper 89, ringer relay springs 103 and 104.- to the calling subscribers rotary line conductor 42, thence through the primary winding 15, transmitter 17, condenser 40 to the vertical line conductor 41, and through the vertical line relay 34 of the connector C and winding 76 of the differential relay 77 to the batte lead 51 and to the busy coil H. When t e subscriber hangs up his receiver, after receiving the busy signal, he grounds the line conductors 41 and 42 simultaneously, energizing the line relays 74 and of the connector C, as already explained. and producin the release of the switching apparatus as rmerly.

The pay-station attachment used in connection with the substations, as described, consists essentially(Figs. 2 and 3) of the relay 7, ground' closing springs 2 and 3 which are controlled by the arm 4, a cointrough or chute M, shutter closing arm N suitably securcdto the switch-hook, and a. coin-receiving box 0 The various arts are suitably mounted and contained within the case P. The coin-box O is provided with a cover 141 and a suitable lock 142 for securing the cover in place. Similarly, thecase P is provided with a cover Q and a lock 143. The relay 7 is .mounted upon the bracket 144 and firmly secured thereto by the screw 145, and the said bracket is in turn secured to the case P by means of the 1 ,aensu screw 146. Upon the said bracket are mounted the springs 9 and 10 insulated from each other and from the bracket. In Fig. 3 the relay 7 is shown in normal position. The tip 19 of the armature 8 is shown extending into the coin-trough M. The object of this provision is to retain the coin in front of the return trough 0r throw-out 147, so that the coin may pass out of the coinbox providing the called party does not answer. Assume that the receiver has been removed, then the switch-hook in its upward course carries the shutter-closing arm N upwardly, thereby closing the passageway 148 from the coin-trough M to the return trough 147. Now when the coin 5 is deposited in the slot 149 it comes to rest in the position shown in dotted lines in Fig. 2. In this position the said coin rests upon the armature tip 19' and ainst the shutter arm N. After the call is completed assume that the calling subscriber receives the bus signal, then in this instance the relay 7 oes not energize-and attract its armature, whereby the coin would pass to the coin-box O. But on the contrary the coin is retained in the said position until the receiver is restored and the shutter-closing arm passes out oii contact with the coin 5 and opens the passageway 148, thereby permitting the coin to pass to the trough 147 'Where it may be recovered by the callin subscriber. g

e coin-trough M is secure to the case P by means of the screws 150. The ground springs 2 and 3 whereby the substation is provided with ground are insulated from each other and from the bracketlfil to which they are secured, and the bracket. is in turn mounted upon the case P by means of the screws 152. Secured to the trough M by means of the screw 153 is the arm 4 which operates to close the springs and 3 in contact when a coin is dropped in the trough as described.

T e winding of the relay 7 may be of any suitable resistance, but with a central battery of fifty volts good results have been obtained when the said relay is wound to a resistance of fifteen hundred ohms.

From the fore oing it will be the operation 0? the subscribers calling mechanism is contingent on first depositing a coin in the toll-box, and that the collection of said coin, as an equivalent 0 eration, is contingent on the answering of t e called subscriber. As shown, the deposit of a com, or some equivalent operation, closes the connectlon to ground, and this makes the mechanism operative for calling. use of the telephone for talking is, it will be seen, contingent on the answering ofthe called subscriber. Finally, the energizing of the pay-station rela. '7 closes the line or charging circuit of e common battery seen that The,

scribers telephone equipment is operative for receiving but not for talking. In this way the called subscriber can be heard to answer, and the calling subscriber can also get the busy signal, which latter is, of course, of more importance.

The connectors C can be arranged on a percentage basis, so as to be less in number than the subscribers. This, with the selector and trunk lines, provide means for automatically trunking a calling line into connection with a called line. If necessary, second or third selectors can -be employed between the first-selector and the connector, and like the latter arranged on a ercentage basis. The first-selectors can, 0 course, be reduced to a percentage basis by any suitable or known arrangement.

What I claim as my invention is 1. A subscribers transmitter, a line circuit for said transmitter, a normally open switch in said circuit, a coin collector, means controlled by thecalled subscriber for closing said switch and operating said coin collector, and a condenser in shunt or parallel with said switch.

2. In a telephone exchange system, a calling and a called subscribers line, means having vertical and rotary motion for extending a talking connection from the calling line to the called line, a pay-station rela and relay energizing .means controlled y the called subscriber, said relay closing and maintaining closed during talking the talking connection.

3. In a telephone exchange system, a calling and a called subscribers line, the combination of means having vertical and rotary motion for extendin a talking connection from the calling line to the called line, a toll device, means including a relay controlled by the called subscriber for operating said device, a talking circuit closed and maintained closed during talking by said relay.

4. In a telephone exchange system, the combination of an automatic switch, a calling mechanism for controlling the vertical and rotary motion of said switch, a central source of talking current, a relay, a pay-station apparatus controlled by said relay by current supplied from said source, and a talking circuit closed by the operation of said relay, said relay maintaining said talking circuit closed during talking.

5. Means having vertical and rotary motion for extending connection from the calling line to the-called line, a subscribers transmitter, a line circuit for said transmitter, a normally open switch in said circuit, a coin collector, means controlled by the called subscriber for closing said switch, and opcrating said collector,- and a condensed in shunt or parallelwith said switch.

6. In a telephone system, means having closed, said pay station equipment controlled .ing a transmitter for said vertical and rotary motion for extendin connection from the calling line to the call line, and a calling subscribers pay-station including a relay controlled by the called subscriber to complete a talkingrsircuit over said connection at the calling su tation, said relay remaining energized during talking.

In a' subscribers pay station equipment, a relay in a normally open circuit, contacts controlled by the switch hook for controlling one break in said circuit, means under the control of the called subscriber to energize said relay when said first break is by said relay, progressively movable automatic switching mechanism for establishing a connection between two subscribers, a talking circuit, said relay closing and maintaining closed during talking said talking circuit substantially as described.

8. In a telephone system, a calling and a called subscribers station, a talking circuit between said stations, a transmitter and a relay at the calling subscribers station, an energizing circuit for said relay independent of said transmitter, a coincollector, and means'by which the called subscriber controls said energizing circuit and operates said collector, said relay closing and maintaining closed during talking the talking circuit.

9. In a. tele hone system, a calling and a called subscri ers station, a talking circuit between said stations, a transmitter and a relay at the calling subscribers station, an energizing circuit for said relay independent of said transmitter, a coin collector, and means whereby the response of the called subscriber closes said energizing circuit and operates said collector, said relay closing and maintaining closed during talking the talking circuit.

10. In a telephone system, a callin and a called subscribers station, a normal y open calling circuit and a primary .circuit includll calling station, normally open contacts in said primary circuit,- com-controlled means for closing said normally open calling circuit, and means under the control of the called subscriber 116 for closing said. normally open contacts.

11. In a telephone exchange system, the combination of a coin collectm toll device and a calling subscribers telep one station,

' circuits and a relay for operatin said 'de- 13 vice controlled by a called subscri rs telephone station, and a talking circuit closed by said relay when the called subscriber answers, said delay maintaining said talking circuit closed during talkin 126 12. A subscribers transmitter, a line circuit for said transmitter, a normally open switch in said circuit, a coin collector, circuits and a relay controlled by the called 1 subscriber for closing said switch and for operating said coin collector, and a condenser in shunt or parallel with said switch.

13. In a telephone exchange system, proessively movable switches aving magnets 5dr producing motion first in one direction and then in a difl'erent direction for extends in connection from the calling line to the ca led line, a pay-station relay, and means controlled by the called subscriber for energizing sai relay. to close a talkingcircuit in said connection, said relay remain ng energized durin talking.

14. In a te ephone exchange system, the combination of progressively movable switches having vertical and rotary motion for extendin connection from the calling line to the ca led line, a toll device, circuits and a relay controlled by the called subscriber for operating said device, and a talking circuit closed and maintained closed durin talking by said relay.

"a talkin 15. rogressively movable switches having magnets for producing motion first in one direction and then in a difi'erent direction for extending connection'from the calling line to the called line, a subscribers transmitter, a line circuit for said transmitter, a normally open switch in said circuit, a coin collector, circuits and a relay controlled by the called subscriber for closing said switch and for operating said collector, and a condenser in shunt or parallel with said switch.

'16. In a telephone system, progressively movable switches having magnets for producing motion first in one direction and then in a difl'erent direction for. extending connection from the calling line to the ca led line, a relay, and a calling subscribers pay-station device controlled by said relay to close a circuit at the calling substation, said circuit maintained closed durin talking by said relay.

17. n a telephone system, the combination of progressively movable switches having magnets for producing motion first in one direction and then in a difi'erent direction for automatically trunking a calling line into talking connection with a called line, a relay, and a calling subscribers paystation device controlled by said relay to close a circuit at the calling substation, said circuit maintained closed during talking by said relay. a

18. In a tele hone system, a calling and a called subscrl ers station, automatic rogressively movable switches'for establi I ing a talkin connection between said stations, a transmitter and a relay at the calling subscribers station, an energizing circuit for said rela independent of said transmitter, a coin co lector, and a magnet by which the called subscriber controls said energizing circuit and ;operates said collector, said renaqnan lay closing and maintaining closed during ta kin the talking circuit.

19. n a tele hone system, a called subscri rs station, automatic progressively movable switches for establishing a talking connection between said stations, a transmitter and a relay at the calling subscribers station, an energizing circult for said relay independent of said transmitter, a coin collector, and a magnet controlled by the called subscriber to close said energ zing circuit and operate said collector, said rela closing and maintaining closed durin ta kin the talking circuit.

20. n a te ephone system, a calling and a called subscribers station, a normally open calling circuit and a primary circuit including a transmitter for said callin statlon, normally open contacts in said mary OlIC-lllt, a coin-controlled switch for closing said normally open calling circuit, and a circuit and a relay under the control of the called subscriber for closing said normally open contacts.

In a telephone system, a telephone stat1on, measured service means therefor comp'ising equipment for controlling the operariveness of the telephone, a relay havmg a1.- armature, another telephone station, means comprising automatic progressively movable switching mechanism for connecting the two stations, means under control of said other station for energizing said relay for operating said measured service means and for maintaining said relay energized, whereby said measured service means is held operated to render the telephone operative for talking between said stations.

22. In a telephone system, a telephone station, measured service means therefor comprising a circuit controlling the operativeness of the telephone, a relay having an armature, another telephone station, means a calling and pricomprising automatic progressively movable switching mechanism for connectin said stations, means under control of the other station for energizing said relay for operating said measured service means and for maintaining said relay energized, whereby said circuit in the measured service means is held closed to render the telephone operative for talking between the. said stations.

23. In a telephone exchange system, the combination of a pair of telephone stations, talking transmitters for said stations, an automatic progressively movable switch for establishin a connection between said stations, a ca ling mechanism for controllin said switch, a central source of current, sai switch comprising means for supplying current from said source to said stations over the conductors of said connection for talking purposes, measured service equi ment comprising circuit for controlling t e operativeness of the transmitter of one of said telephone stations, a relay for controlling said equipment said relay connectel to said connection and energized by the current supply for talkin purposes to close the talking circuit in t c said measured service equipment to enable subscribers to talk between said stations, the said relay being maintained energized during talking.

24. In a telephone system, a pair of telephone stations, means comprisin an automatic progressively movable switc for connecting the two stations, a subscribers pay station equipment including a circuit for one of said telephones, a calling mechanism for controlling said switch, the o eration of said switch by said mechanism eing contingent on the deposit of a coin, and a relay controlled from the other of said stations when the subscriber answers for closing said circuit at said pay station to render the first telephone operative for tal'kin said relay remaining energized durin tal ing.

2o. In a telephone ex ange system, a calling and a called subscriber s station automatlc progressively movable switching mechanism for establishing a connection between the said stations, a pay station apparatus for the calling station, a relay for controlling said up aratus, a central source of current for tal ing pur oses means controlled b the called station or supplying current rom said source to energize said relay to close a talkin circuit in said connectlon, the said relay eing maintained en ergized durin talking.

26. In a te ephon'e exchange s stem, the combination of calling and call subscribers statlons having lines that terminate in the exchange, automatic progressively movable switchin mechanism or establishin a connection tween a calling and a called station, a pay station apparatus for the call ing station, equipment at said calling station for operating said switching mechanism, the operation of said switching mechanism bv said equipment being dependent upon the deposit of a coin in said ay station apparatus, a relay at the calling station, said relay being energized by the called station to supply battery current to the talking equipment, said relay being maintained energized during talking.

27. In a telephone system, a calling and a called subscribers station, equipment including talking transmitters at said station, automatic progressively movable switching mechanism for establishing a connection between said stations, an open metallic circuit for the transmitter of the calling station after the connection to a called station is established, a pay station apparatus and a relay for the calling station, means under the control of said called station for energizin said. relay to close and maintain close during talking the metallic circuit for said transmitter and for controlling said pay station apparatus.

28. A telephone. exchange systemcomprising a telephone line extending from a substation to an exchange, means at the substation for receiving the deposited token, means including said token receiving means for initiating a call, relay mechanism for disposing of the deposited token, and means for actuating said mechanism to establish a talkin circuit at the substation irres ective of tl ie presence of the token in the to en receiving means.

Signed by me at Ohica 0, Cook county, Illinois, this 9th day of ovember, 1906.

ROY C. GIFFORD.

Witnesses:

EDWARD D. Fame, ARTHUR B. Srnnnr.

It is hereby certified that in Letters Patent No. 1,281,251, gr -nl ocwbfll 1918, upon the application of Roy 0. Gifl'ord, of Chicago, Illinois, for an improvemcnt in Measured-Service Telephone Systems," errors appoar in the printed specification roq uiring correction as follows: Page 2, line 57, for the word through road though; page 3, line 109, for the roferenco-numeral 91 road 8!; page 7, line 85, claim 7, strike out the words substantially as dascribocl; same page, line 124, claim 11, for the word "dolay road relay; and that the said Letters Patent should be read with those corrections therein that the some may conform to the record of the cm in the Patent Olfice.

Signed and mud this 26th day of November, A. 1)., 191s.

[and R. 1 WHITEHEAD,

Acting Commissioner of Patents. CL 179-65. 

